Pipe Insulation - Daikin VRV II Series Design, Installation & Testing Instructions

Si39-303
!
Not recommendable but in case of emergency
You must use a torque wrench but if you are obliged to install the unit without a torque wrench,
you may follow the installation method mentioned below.
After the work is finished, make sure to check that there is no gas leak.
When you keep on tightening the flare nut with a spanner, there is a point where the tightening
torque suddenly increases. From that position, further tighten the flare nut the angle shown
below:
Disposal requirements
Dismantling of the unit, treatment of the refrigerant, oil and eventual other parts, should be done
in accordance with the relevant local and national regulations.
6.5

Pipe Insulation

After finishing the leak test and vacuum drying, the piping must be insulated. Take into account
the following points:
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4
Caution Be sure to insulate local pipes, as touching them can cause burns.
Installation Manual
After all the piping has been connected, use nitrogen to perform a gas leak check.
tightening
pipe size
torque (Ncm)
φ9.5
3270 - 3990
φ12.7
4950 - 6030
φ15.9
6180 - 7540
Pipe size Further tightening angle
9.5 (3/8") 60 to 90 degrees
12.7 (1/2") 30 to 60 degrees
19.1 (5/8") 30 to 60 degrees
Make sure to insulate the connection piping and refrigerant branch kits entirely.
Be sure to insulate the liquid-side and gas-side piping for the inter-unit piping and the
refrigerant branch kits and always use Q18-type or better insulation for the oil pressure
equalizer.
Not insulating them may cause leaking. (The gas piping can reach temperatures of 120°C.
Be sure the insulation used can withstand such temperatures.)
If you think the humidity around the cooling piping might exceed 30°C and RH80%, reinforce
the insulation on the cooling piping (at least 20mm thick). Condensation might form on the
surface of the insulation.
If there is a possibility that condensation on the shut-off valve might drip down into the indoor
unit through gaps in the insulation and piping because the outdoor unit is located higher than
the indoor unit, etc., this must be prevented by corking the connections, etc.
One outdoor unit installed
(1) RXYQ5-16MY1B
2
3
5
6
A (mm) flare shape
12.8 - 13.2
16.2 - 16.6
19.3 - 19.7
Recommended arm length of tool
Approx. 200 mm
Approx. 250 mm
Approx. 300 mm
When multiple outdoor units installed
(8) RXYQ18-48MY1B
7
2
3
5
4
6
90 ±2
A
R=0.4~0.8
1. One outdoor unit installed
2. Liquid line shutoff valve
3. Gas line shutoff valve
4. Outer-to-inner interconnecting piping
5. Calking treatment, etc.
6. Heat insulator
7. Oil-equalizing line shutoff valve
8. When multiple outdoor units installed
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